Insulation structure of rotary transformer stator
By adjusting the number of turns and insulation thickness of the stator protruding magnetic poles of the rotary transformer, the signal distortion problem caused by increased winding resistance was solved, and high-precision rotary transformer signal output was achieved.
Patent Information
- Application Number
- CN202511742167.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-02-17
AI Technical Summary
In the VRS mode of a rotary transformer, the increased winding length of the outer coil leads to increased winding resistance, making it difficult to balance and adjust the signal characteristics, and thus difficult to generate an ideal VRS signal.
By adjusting the number of winding turns of each protruding magnetic pole, the insulation thickness of the stator protruding magnetic pole of the rotary transformer is changed to ensure that the number of winding turns and insulation thickness of each protruding magnetic pole are matched, so as to control the winding length. The first and second insulators of the annular insulating cover are symmetrically distributed, and the insulation structure is manufactured using a two-part or one-piece molding process.
It effectively suppresses signal distortion caused by increased winding length, improves the accuracy and balance of the output signal, and simplifies the signal conditioning process.
Smart Images
Figure CN121545893A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of rotary transformers, and in particular to an insulation structure of a rotary transformer stator. BACKGROUND
[0002] In the prior art, a rotary transformer has, for example, a stator core having a plurality of teeth extending from an inner periphery of a main body portion formed in a ring shape toward a center, and a rotor, and the rotor is disposed on the inner side of the stator core opposite the teeth. A winding is wound around the teeth via an insulator, and the winding is composed of an excitation winding supplied with an excitation current from the outside and two output windings that output two-phase signals according to a rotation angle of the rotor. In a conventional annular insulating cover for covering the projecting poles of the rotary transformer stator, the thickness of each cylindrical insulating portion is uniform for all the projecting poles. The operation modes of the rotary transformer include single-phase excitation / two-phase excitation (VRX mode), two-phase excitation / single-phase output (VRT mode), and two-phase excitation / two-phase output (VRS mode). In particular, in the VRS mode, four-phase windings are wound around each tooth slot, and the length of the magnetic conductive wire increases as the winding goes outward.
[0003] The conventional rotary transformer stator winding structure is configured in the above-described manner, and thus has the following technical problems. From the known structure, the outer surface of each projecting pole is covered with an annular insulating cover having a predetermined thickness and composed of a first insulator and a second insulator, and the insulating cover is manufactured by a known two-part or known one-part molding process. This causes a problem in that, when the rotary transformer adopts the known VRS (two-phase excitation / two-phase output) mode, it is necessary to generate a VRS signal by superimposing two VRT signals. Although the two VRT signals should theoretically have a 90° phase difference and the same characteristics, in reality, the winding resistance of the outer coil increases due to the increase in the length of the wire, and thus it is extremely difficult to adjust the balance of the signal characteristics. SUMMARY
[0004] The present application proposes an insulation structure of a rotary transformer stator, which increases or decreases the thickness of the insulation of the projecting poles of the rotary transformer stator according to the number of turns of the winding of each projecting pole, thereby suppressing the problem of signal distortion of the outer winding due to the increase in the length of the wire.
[0005] Technical solution: The application provides an insulation structure of a resolver stator, which comprises a ring-shaped stator and a plurality of protruding magnetic poles arranged on the ring-shaped stator; an annular insulation cover is arranged on the outer periphery of each protruding magnetic pole; the outer side of the annular insulation cover is recessed inward to form a cylinder portion; a stator winding is arranged outside the annular insulation cover; the stator winding is wound around the surface of the cylinder portion in a multi-layer winding mode; the distance from the outer surface of the protruding magnetic pole to the bottom surface of the cylinder portion is an insulation thickness; and the total distance from the axis of each protruding magnetic pole to the outer edge of the stator winding is the same, which is the sum of the radius of the magnetic pole, the insulation thickness and the distance from the periphery of the stator winding to the bottom surface of the cylinder portion.
[0006] Preferably, the protruding magnetic poles are uniformly arranged along the circumference of the ring-shaped stator.
[0007] Preferably, the protruding magnetic poles protrude inward or outward along the circumference of the ring-shaped stator.
[0008] Preferably, the stator winding adopts a variable reluctance type structure with two-phase excitation and two-phase output.
[0009] Preferably, the annular insulation cover comprises a first insulation body and a second insulation body, the first insulation body and the second insulation body are symmetrically distributed about the protruding magnetic pole, and the first insulation body and the second insulation body are made into the annular insulation cover through a two-part or one-piece forming process.
[0010] Beneficial effects: By adjusting the insulation thickness according to the number of turns of the stator winding of each protruding magnetic pole, the application can inhibit the problems caused by the lengthening of the outer winding, thereby helping to improve the accuracy of the output signal. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 FIG. 1 is a longitudinal sectional view of the protruding magnetic pole and the annular insulation cover of the resolver of the embodiment of the application;
[0012] Figure 2 FIG. 3 is a sectional view of the embodiment of the application based on A-A line, showing the first insulation thickness; Figure 1 FIG. 4 is a sectional view of the embodiment of the application based on A-A line, showing the second insulation thickness; Figure 1
[0013] Figure 3 FIG. 6 is a schematic view of the inward protruding magnetic pole in the embodiment of the application;
[0014] Figure 4 FIG. 7 is a schematic view of the outward protruding magnetic pole in the embodiment of the application. DETAILED DESCRIPTION
[0015] With reference to the drawings, a preferred embodiment of the stator insulation structure of a resolver according to the present application is described. The stator insulation structure of a resolver according to the present application comprises a ring-shaped stator 1, and protruding magnetic poles 1A provided on the ring-shaped stator 1. An annular insulation cover 6 is provided on the outer periphery of the protruding magnetic poles 1A. The annular insulation cover 6 is recessed inwardly to form a cylindrical portion 10. A stator winding 11 is provided on the outer periphery of the annular insulation cover 6. The stator winding 11 is provided on the recessed surface of the cylindrical portion 10 in a multi-layer winding manner. The distance between the outer surface of the protruding magnetic poles 1A and the bottom surface of the cylindrical portion 10 is the insulation thickness T. The insulation thickness T is determined according to the number of turns of the stator winding 11. The total distance between the axis of each protruding magnetic pole 1A and the outer edge of the stator winding 11 is the same. The total distance is the sum of the radius of the protruding magnetic pole 1A, the insulation thickness T, and the distance between the circumferential direction of the stator winding 11 and the bottom surface of the cylindrical portion 10.
[0016] As shown in Figure 3 and Figure 4 , the protruding magnetic poles 1A are uniformly arranged along the circumference of the ring-shaped stator 1. The protruding magnetic poles 1A are arranged on the circumference of the ring-shaped stator 1 in a manner protruding inwardly or outwardly. The stator winding 11 adopts a variable reluctance type structure with two-phase excitation and two-phase output. The annular insulation cover 6 comprises a first insulation body 4 and a second insulation body 5. The first insulation body 4 and the second insulation body 5 are symmetrically distributed with respect to the protruding magnetic poles 1A. The first insulation body 4 and the second insulation body 5 are manufactured into the annular insulation cover 6 by a two-part or one-part molding process.
[0017] In Figure 1 , the protruding magnetic poles 1A protruding inwardly are integrally formed on the circumference of the ring-shaped stator 1 at a predetermined angle interval.
[0018] Since Figure 1 the cross-sectional view shows a known ring-shaped stator 1 in the shape of a doughnut, in Figure 1 , the other side 3 of the ring-shaped stator 1 forms the outer periphery 1B of the stator. As shown in Figure 3 and Figure 4 , each protruding magnetic pole 1A of the ring-shaped stator 1 can adopt a known inner rotor or outer rotor type structure, which can be selected to protrude inwardly or outwardly.
[0019] On the protruding magnetic poles 1A of the ring-shaped stator 1, an annular (cylindrical) insulation cover 6 as an insulation body is provided, which is recessed in cross-section to cover the magnetic pole surface 1AA. The annular insulation cover 6 is composed of a first insulation body 4 and a second insulation body 5.
[0020] The annular insulation cover 6 can be formed in two ways: using pre-formed first and second insulation bodies 4, 5 to cover the surface 1AA of the protruding magnetic poles 1A as shown in Figure 1 ; or fixing the ring-shaped stator 1 in a mold of an injection molding machine not shown by a core, and integrally injection molding each insulation body 4, 5 by using resin as shown in Figure 1As shown, it forms an integral structure with the protruding magnetic pole 1A.
[0021] On the surface 1AA of the protruding magnetic pole 1A, an annular insulating cover 6, which serves as an insulator, can be provided by means of either a separate or integral molding method as described above. The annular insulating cover 6 has a cylindrical portion 10 that surrounds the surface 1AA of the protruding magnetic pole 1A, and the insulation thickness T is defined as the distance from the outer surface of the protruding magnetic pole 1A to the bottom surface of the cylindrical portion 10.
[0022] Figure 2 (A) and Figure 2 (B) is based on Figure 1 The cross-sectional view of the AA line shows two examples of adjusting the insulation thickness T based on the change in the number of turns of the stator winding 11 in the winding slot 12 of the protruding magnetic pole 1A. It should be noted that, due to... Figure 2 (A) and Figure 2 (B) are all based on Figure 1 The dimensions of the AA section and the annular stator 1 in the figure remain consistent.
[0023] exist Figure 2 In case (A), due to the ratio of the number of turns of the stator winding 11 wound in the winding slot 12 of the annular insulating cover 6 protruding magnetic pole 1A... Figure 2 (B) has more stator windings 11, therefore the first insulation thickness T1 is set to be less than Figure 2 (B) The second insulation thickness T2 is able to be with Figure 1 A longer stator winding 11 is wound with the same diameter as the first outer diameter D1 of the middle stator winding 11.
[0024] And in Figure 2 In case (B), the conditions are the same as Figure 2 (A) On the contrary. Because the number of turns of the stator winding 11 wound in the winding slot 12 is less than... Figure 2 (A), and the second insulation thickness T2 and the first insulation thickness T1 satisfy the relationship T2>T1, therefore Figure 2 (B) The second outer diameter D2 of the middle stator winding 11 and Figure 1 The first outer diameter D1 of the middle stator winding 11 remains the same.
[0025] Therefore, the total distance from the axis of the protruding magnetic pole 1A to the outer edge of the stator winding 11 is the same. When the number of turns in the stator winding 11 is small, the corresponding insulation thickness T increases; when the number of turns in the stator winding increases, the insulation thickness T decreases. Adjusting the thicknesses T1 and T2 of the first and second insulation according to the number of turns of the stator winding 11 on each protruding magnetic pole 1A of the rotary transformer's annular stator 1 can effectively suppress the problem of excessive winding length on the outer side of the annular insulation cover 6. Especially when using the known VRS method (2-phase excitation / 2-phase output), it is easier to balance the two VRT signals (the known 2-phase excitation / 1-phase output), thereby helping to improve the accuracy of the rotary transformer's output signal.
[0026] The stator insulation structure of the rotary transformer involved in this invention can effectively suppress the problem of excessive length of the outer winding by adjusting the insulation thickness according to the number of turns of the stator winding of each protruding magnetic pole, which helps to improve the accuracy of the output signal and can easily obtain a high-precision rotary transformer.
Claims
1. An insulating structure of a resolver stator, characterized by, The application relates to a ring-shaped stator (1), a plurality of protruding magnetic poles (1A) on the ring-shaped stator (1), a ring-shaped insulating cover (6) on the outer periphery of each protruding magnetic pole (1A), a cylinder part (10) formed by inwardly recessing the outer side of the ring-shaped insulating cover (6), a stator winding (11) arranged outside the ring-shaped insulating cover (6), the stator winding (11) being wound around the recessed surface of the cylinder part (10) in a multi-layer winding mode, the distance from the outer surface of the protruding magnetic pole (1A) to the bottom surface of the cylinder part (10) being an insulating thickness, the total distance from the axis of each protruding magnetic pole (1A) to the outer edge of the stator winding (11) being the same, and the total distance being the sum of the radius of the magnetic pole (1A), the insulating thickness and the distance from the circumferential direction of the stator winding (11) to the bottom surface of the cylinder part (10).
2. The insulating structure of a resolver stator according to claim 1, characterized by, The protruding magnetic poles (1A) are uniformly arranged along the circumference of the ring-shaped stator (1).
3. The insulating structure of a resolver stator according to claim 1, characterized by, The ring-shaped stator (1) is provided with protruding magnetic poles (1A) protruding inwardly or outwardly along the circumference.
4. The insulating structure of a resolver stator according to claim 1, characterized by, The stator winding (11) adopts a variable reluctance type structure with two-phase excitation and two-phase output.
5. The insulating structure of a resolver stator according to claim 1, characterized by, The ring-shaped insulating cover (6) comprises a first insulator (4) and a second insulator (5), the first insulator (4) and the second insulator (5) are symmetrically distributed relative to the protruding magnetic poles (1A), and the first insulator (4) and the second insulator (5) are made into the ring-shaped insulating cover (6) through a two-part or one-part forming process.